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's turn back to the investigation and talk to jim walsh, an international security and terrorism expert at m.i.t. let's talk about law enforcement. what are they looking for now? how do they go about this investigation? take us through some of those steps? and within that, we have to start forming some theories. from what we know already, do you think that it is maybe an individual or probably a group and how do you go about figuring out, is this a foreign group or individual, or americans? >> yeah. those are big questions and there are a lot of them. let me start in the beginning and say in terms of the phase of the investigation, i think there are different parts and different parts of the government are handling different parts of the investigation. so obviously, the most important and immediate thing are those events and evidence that are near the attack. that are approximate to the attack. that includes the crime scene. that includes the material used in the bomb and the process of reconstructing what that bomb looked like. it is designed, the materials it used. the nature of the t
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